In order to activate the eParcel rates on your store, we need to run through a few steps.
1. Register for a Developer account on the Australia Post Developer platform - https://developers.auspost.com.au/
2. While logged into the Developer account register for the Shipping & Tracking API - https://developers.auspost.com.au/apis/st-registration
3. You will receive testbed credentials from the Shipping & Tracking process which you can email to firstname.lastname@example.org with your myshopify.com domain and we can proceed with having your account verified.